Lighting fixture



l oct. 12, 1937.

. Filed May 25, 1935 P. D. PHILLIPS LIGHTING FIXTURE Patented Oct. 12,1937 PATENT OFFICE 2,095,761 LIGHTING FIXTURE Paul D. Phillips,Elmhurst, Ill.,

jamin Electric Mfg. Company,

a corporation of Illin Application May 25,

2 Claims.

' My invention relates to lighting fixtures. More particularly, itrelates to a type of fixture for use in locations which require that thefixtures be dust-proof, such as our or feed mills, grain elevators,starch and sugar mills, etc. A dust-laden atmosphere, such as is foundin a iiour or starch mill, is likely to be highly explosive and greatcare must be taken against its becoming ignited. In such an atmosphere,the dust is apt to settle on some rather flat surface of the fixture,forming a layer which may become heated to a ternperature suicient tocause ignition.

One of the objects of my invention is toprovide a fixture which willminimize the danger of dust settling on the fixture and becomingignited.

Further objects o f the invention will be apparent from the descriptionand claims.

In the drawing, the single gure shows a part side-elevational, p-artsectional view of a xture embodying my invention.

Referring to the drawing in detail, the construction shown comprises ahood i, reflector means 2, a socket 3, and a lens 4, the hood, re-

A study also disclosed that the following purposes: (1) The under sideof this shield, being of polished aluminum, forms a good heat reflectorand turns back a large proportion of the heat which reaches .it from theassignor to Ben- Des Plaines, Ill., ois

1935, serial No. 23,364 (ci. 24o-11.3)

enameled steel rei-lector underneath; (2) since this spun aluminumshield fits tightly against the-reflector at top and bottom,particularly in view of the asbestos gasket i 8, a dead air space isprovided between the shield 'l and the annular reflector portion 6,which acts as air insulation to prevent excessive temperature rise ofthe shield 7; (3) as the outer surface of the shield l1 is considerablymore sloping than the annular reiiector portion 6, it tends to lessenthe amount of dust settlingon this part fect giving a stream line designto the fixture.

Also, with a View to lessening the danger of dust explosions and alsowith a View to preventing Waste of light, a plurality of innerreflectors poses and to reflect backward heat that would otherwise reachthe lower portion of the aluminum hood and which might cause a dangerousrise of temperature. As shown by the lines indicating the direction ofreflection, these reilectors are so designed that they reflect the lightAny suitable materials may be used, the hood i being made of castaluminum with a removable cast iron cap i0. The main reector portion maybe of porcelain enamel. The socket is held in place in the cap by meansof screws Il extending through the socket and threaded into the cap, anda suitable sealing gasket I2 is provided for the entrance of the feedwires.

The two annular reflector members 8 and 9 may be held in place by thehood by means of outwardly extendingflanges swedged over into an annularrecess in the hood. The main reiiector member is provided with a screwthreaded neck I3 which is screwed into the lower threaded portion of thehood.V This screw threaded neck is provided with an inwardly extendingange i4 for forming with the gasket l5 one of the seals of theenclosure. When the main reflector member is removed by unscrewing it,the gasket is still held in place by means of tongues I6 punched outfrom the lower annular reflector member 9 and engaging the gasket. Themain reector member may be secured in position by mans of a set screw I1threaded through the Y secured in place in any suitable manner toprovide a substantially dust-proof enclosure, Vas Y:by means of'aretaining ring I9 having an inwardly extending annular shoulder -20 andsecured to the mainV reector member by Lmeans of'screws. V2|. Suitablegaskets Y22 and 23 are provided, the upper onebeing shellackedin placetof hold itin position when the lens is removed.

It will be seen that the construction shown .provides a .constructionwhich will prevent dust Y from settling on that-part ofthereilectorwhich is subjected to the Ygreatest heat and that an airspaceisprovided .to `afford heat insulation betweenr'the reector memberlandthe shield.

' T'Furth'er modifications will be apparent to those skilled in theartand itis desired therefore that VY.the Vinvention .be limited Yonlyby the prior `art A.and the scope of the appendedclaims.

. Having thus described my invention, what I Y ,claim and desire tosecure by Letters Patent is:

1. Alight construction comprising a hood, re-

Y flectoi means, aV-socket and lens, said reflector means andlensforming an enclosure for the lamp supported in thesocket, saidsocket being mounted on said hood in position to support a lampextending downwardlytherefrom into said enclosure, said reflector meanshaving an annular heat from a lamp,

outwardly and downwardly sloping portion extending from said hood, thebulb of the lamp being spaced a substantial distance from the innersurface of the hood, said reflector means including an annular reflectormember mounted in the hood and closely surrounding the neck of the bulbfor reflecting the rays falling thereon toward a zone at or near theouter periphery of the lens, and a second annular reflector membermounted in the hood and closely surrounding a portion of the bulb belowthe neck portion for reflecting the rays falling thereon toward a zoneat or near the outer periphery of the lens.

2. vA dustproof xture construction comprising a dustproo'f enclosure, asocket for supporting an electric lamp in said dustproof enclosure, anda shieldV for preventing dust from settling on a portion Yof saidenclosure which is exposed to the said enclosure comprising a hood inwhich the socket is mounted, an inverted bowl-like reflector `extendingdownwardly from said hood, and a lens adjacent the lower edge of thereflector, said shield being'annular in form and lying abovean annularportion of the reflector, said shield being spaced from said annularreector portion throughout the greater portion of its extentandcooperating with said annular reflector portion to form a dust-tightenclosure, thus preventing access of dust to the hot annular reflectorportion and providing a dead air insulating space between -the hotreflector portion and the shield, allof the exposed portions of saidshield having a greater slope than the portions of the reflectordirectly underneath, whereby less dustl will settle on the fixture thanwouldbe the case if the shield were omitted.

PAUL D. PHILLIPS.

